EP2774742B1 - Machine de moulage à injection - Google Patents

Machine de moulage à injection Download PDF

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Publication number
EP2774742B1
EP2774742B1 EP14156527.5A EP14156527A EP2774742B1 EP 2774742 B1 EP2774742 B1 EP 2774742B1 EP 14156527 A EP14156527 A EP 14156527A EP 2774742 B1 EP2774742 B1 EP 2774742B1
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EP
European Patent Office
Prior art keywords
ball screw
shaft
lubricant
injection
molding machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14156527.5A
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German (de)
English (en)
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EP2774742A1 (fr
Inventor
Takuro Hatakeyama
Yosuke Tokui
Yoshitaka Matsutake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Publication of EP2774742A1 publication Critical patent/EP2774742A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/83—Lubricating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/83—Lubricating means
    • B29C2045/835—Lubricating means for ball screws or ball nuts

Definitions

  • the present invention relates to an injection molding machine.
  • the basic motion of an injection molding machine is a linear motion, and a ball screw mechanism is used for converting the rotational motion of the motor into a linear motion (see, for example, Patent Document 1).
  • the ball screw mechanism is constituted by, for example, a ball screw shaft, a ball screw nut, and a ball.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2004-249637
  • EP 2 540 472 A1 discloses an injection device including a rotary slide member formed into a cylindrical shape and provided with a first spline on an outer periphery thereof, one side of which is connected with a screw and the other side of which is connected with a ball screw connected with an injection motor, a plasticizing motor provided to surround the rotary slide member, having a second spline adapted to engage with the first spline and to rotate the rotary slide member, wherein the rotary slide member includes at least one supply passage to supply lubricant from an inside of the rotary slide member to an engagement location of the first spline and the second spline.
  • WO 2007/036244 A1 discloses a closing unit for an injection molding machine, comprising joints, a lubricant supply system for lubricating the joints with a liquid lubricant, especially lubricating oil, and having a first lubrication cycle, and at least one spindle drive having a spindle and a spindle nut, engaged therewith, especially for actuating a toggle drive or an ejector, wherein a lubricant supply system for lubricating the spindle/spindle nut combination having a second lubrication cycle is provided.
  • WO 2007/036243 A1 discloses a spindle drive for an injection molding machine with a lubricating device of the lubricant bath type, said spindle drive having a spindle nut and a spindle, wherein at least in the area of relative movement between the spindle and the spindle nut, a lubricant reservoir for receiving a liquid lubricant is provided and substantially encloses the spindle, one end of the lubricant reservoir being at least partially configured by the spindle nut and the other end by a bearing or retaining area of the spindle.
  • DE 10 2010 051 766 A1 discloses a spindle drive for an injection molding machine, the spindle drive comprising a spindle, a spindle nut, a lubrication portion between spindle and spindle nut and a sealing portion, wherein a first lubricant seal is provided at one and of the lubrication portion, and a second lubricant seal is provided at the same end of the lubrication portion, and wherein a lubricant drain is provided between the first and the second lubricant seal.
  • DE 10 2008 057 073 A1 discloses a drive unit for an injection molding machine, the drive unit having a linearly movable drive and a cover for a movable part of said drive, wherein a volume-variable space between the movable part and the cover comprises lubricant, wherein the volume-variable space communicates with a volume-variable container, and wherein the cover has an opening for communication between the volume-variable container and the volume-variable space.
  • the present invention is made in light of the above problems, and provides an injection molding machine capable of reducing the total usage amount of lubricant used in a ball screw mechanism and a shaft bearing according to claim 1.
  • FIG. 1 is a partial cross-sectional view illustrating a mold clamping unit and an ejector unit of an injection molding machine according to an embodiment, which does not form part of the present invention.
  • the movement direction of a movable platen in the mold opening process is referred to as a forward direction
  • the movement direction of a movable platen in the mold closing process is referred to as a backward direction.
  • a mold clamping unit 10 is for performing mold closing, mold clamping, and mold opening.
  • the mold clamping unit 10 includes a stationary platen 12, a movable platen 13, a rear platen 15, a tie bar 16, a toggle mechanism 17, a mold clamping ball screw mechanism 18, and a mold clamping motor 19.
  • the stationary platen 12 may be fixed to a frame Fr.
  • the rear platen 15 is disposed so as to be spaced apart from the stationary platen 12.
  • the rear platen 15 and the stationary platen 12 are joined by a plurality (for example, four) of the tie bars 16.
  • the rear platen 15 is placed so as to be capable of advancing and retreating with respect to the frame Fr.
  • the movable platen 13 is disposed between the stationary platen 12 and the rear platen 15, and is capable of advancing and retreating along a guide Gd laid on the frame Fr.
  • a movable mold 33 is attached on the side of the movable platen 13 facing the stationary platen 12.
  • a stationary mold 32 is attached on the side of the stationary platen 12 facing the movable platen 13.
  • the stationary mold 32 and the movable mold 33 constitute a mold unit 30.
  • the toggle mechanism 17 is disposed between the movable platen 13 and the rear platen 15.
  • the toggle mechanism 17 is constituted by a cross head 17a capable of advancing and retreating with respect to the frame Fr, and a plurality of links for transmitting, to the movable platen 13, a thrust which is input to the cross head 17a.
  • the toggle mechanism 17 generates a mold clamping force obtained by multiplying the thrust of the cross head 17a by a toggle magnification.
  • the mold clamping ball screw mechanism 18 converts the rotational motion of the mold clamping motor 19 into a linear motion, and transmits the linear motion to the toggle mechanism 17.
  • the mold clamping ball screw mechanism 18 is constituted by a mold clamping ball screw shaft 18a and a mold clamping ball screw nut 18b.
  • the mold clamping ball screw shaft 18a is joined to an output shaft of the mold clamping motor 19 via a belt and a pulley; however, the mold clamping ball screw shaft 18a may be coaxially joined to the output shaft.
  • a shaft bearing that rotatably supports the mold clamping ball screw shaft 18a is held by the rear platen 15, and the mold clamping ball screw nut 18b is fixed to the cross head 17a.
  • the mold clamping motor 19 rotates the mold clamping ball screw shaft 18a, to cause the mold clamping ball screw nut 18b to advance and retreat, so that the cross head 17a advances and retreats, and the toggle mechanism 17 is activated.
  • the mold closing, mold clamping, and mold opening are performed.
  • the mold clamping ball screw mechanism 18 may have various configurations.
  • the mold clamping ball screw nut 18b may be fixed to the rear platen 15, and a shaft bearing rotatably supporting the shaft part extending in the forward direction from the mold clamping ball screw shaft 18a may be fixed to the cross head 17a.
  • the shaft part extending in the backward direction from the mold clamping ball screw shaft 18a is splined to the output shaft of the mold clamping motor 19.
  • the mold clamping motor 19 rotates the mold clamping ball screw shaft 18a and also moves the mold clamping ball screw shaft 18a in the shaft direction, and causes the cross head 17a to advance and retreat.
  • An ejector unit 20 is for ejecting the molding product from the mold unit 30 that is in a mold open state.
  • the ejector unit 20 is constituted by an ejector motor 21, an ejector ball screw mechanism 22, a shaft bearing holder 23, and an ejector rod 24.
  • the ejector ball screw mechanism 22 converts the rotational motion of the ejector motor 21 into a linear motion, and transmits the linear motion to the shaft bearing holder 23.
  • the ejector ball screw mechanism 22 is constituted by an ejector ball screw shaft 22a, an ejector ball screw nut 22b, etc.
  • the shaft part extending in the backward direction from the ejector ball screw shaft 22a is splined to the output shaft of the ejector motor 21, rotates together with the output shaft of the ejector motor 21, and moves in the shaft direction with respect to the output shaft of the ejector motor 21.
  • the ejector ball screw nut 22b is fixed to the movable platen 13.
  • the ejector ball screw mechanism 22 may have various configurations. For example, by the rotation of the ejector ball screw shaft 22a, the ejector ball screw nut 22b may advance and retreat.
  • the shaft bearing holder 23 holds a shaft bearing that rotatably supports a shaft part extending in the forward direction from the ejector ball screw shaft 22a, and moves together with the ejector ball screw shaft 22a.
  • the shaft bearing holder 23 is stopped from rotating by a guide bar 25.
  • the guide bar 25 is fixed to the movable platen 13, and guides the advancing and the retreating of the shaft bearing holder 23.
  • the ejector rod 24 advances and retreats together with the shaft bearing holder 23, and pushes an ejecting member disposed in the movable mold 33 to eject the molding product from the movable mold 33.
  • the ejector motor 21 rotates the ejector ball screw shaft 22a, and also causes the ejector ball screw shaft 22a to advance and retreat in the shaft direction, and causes the shaft bearing holder 23 and the ejector rod 24 to advance and retreat.
  • the ejector motor 21 may be a servo motor. The case of the ejector motor 21 is fixed to the movable platen 13.
  • the ejector unit 20 may have a toggle mechanism.
  • the toggle mechanism is provided between a slider that is movable with respect to the movable platen 13, and an ejector base fixed to the movable platen 13.
  • the shaft bearing holder 23 has a role of a cross head of the toggle mechanism.
  • the ejector rod 24 moves together with the slider; not with the shaft bearing holder 23.
  • FIG. 2 is a partial cross-sectional view of an injection unit of an injection molding machine according to a first embodiment of the present invention.
  • the movement direction of the screw in the filling process is referred to as a forward direction
  • the movement direction of the screw in the plasticizing process is referred to as a backward direction.
  • An injection unit 40 is a unit for melting the molding material, plasticizing the molten molding material, and supplying the plasticized molding material to fill the mold unit 30 that is in a clamped mold state.
  • the injection unit 40 is constituted by an injection frame 41, a cylinder 42, a screw 43, a plasticizing motor 44, an injection motor 45, and a lubricant supplying unit 60.
  • the injection frame 41 is constituted by a base 41a, a front support 41b, and a back support 41c.
  • the front support 41b and the back support 41c are respectively fixed to the base 41a.
  • a pressure plate 46 is disposed, which is movable with respect to the base 41a.
  • the cylinder 42 melts the molding material.
  • the back part of the cylinder 42 is held by the front support 41b.
  • a hopper 49 which is a material supplying unit for supplying the molding material (for example, molding material pellets) inside the cylinder 42.
  • the material supplying unit of the present embodiment is constituted by the hopper 49; however, the material supplying unit may be constituted by a feed screw by which the supplying amount can be adjusted.
  • the screw 43 is disposed so as to be rotatable and capable of advancing and retreating, inside the cylinder 42.
  • a spiral groove is formed in the screw 43, and molding material is supplied into the groove from the hopper 49. When the screw 43 rotates, the molding material is sent in the forward direction along the spiral groove.
  • the depth of the groove may be fixed, or may vary according to the position.
  • the plasticizing motor 44 rotates the screw 43 inside the cylinder 42.
  • the rotation of the plasticizing motor 44 is transmitted to a driving shaft 47 via a belt and a pulley, and the screw 43 is rotated together with the driving shaft 47.
  • the belt and the pulley may not be provided, and the output shaft of the plasticizing motor 44 may be coaxially joined to the driving shaft 47.
  • the plasticizing motor 44 rotates the screw 43 in the plasticizing process, and sends forward the molding material, which has been supplied in the spiral groove formed in the screw 43.
  • a plurality of band heaters are provided on the outer periphery of the cylinder 42.
  • the heat of the plurality of band heaters is transmitted to the cylinder 42.
  • the transmitted heat gradually melts the molding material that is moving forward in the cylinder 42.
  • the molten molding material is sent to the front of the screw 43.
  • the screw 43 is caused to retreat.
  • the plasticizing process is completed.
  • the injection motor 45 moves the screw 43 in the cylinder 42.
  • the rotation of the injection motor 45 is transmitted to an injection ball screw mechanism 48.
  • the injection ball screw mechanism 48 converts the rotational motion of the injection motor 45 into a linear motion, and transmits the linear motion to the pressure plate 46.
  • the injection ball screw mechanism 48 is constituted by an injection ball screw shaft 48a and an injection ball screw nut 48b.
  • the injection ball screw shaft 48a is coaxially joined to the output shaft of the injection motor 45, but may be joined to the output shaft of the injection motor 45 via a belt and a pulley.
  • the injection motor 45 is fixed to the back support 41c, and the back support 41c holds a shaft bearing 53 that rotatably supports a shaft part extending in the backward direction from the injection ball screw shaft 48a. Accordingly, the injection ball screw shaft 48a is incapable of advancing or retreating with respect to the injection frame 41.
  • the injection ball screw nut 48b is fixed to the pressure plate 46, and is capable of advancing and retreating with respect to the injection frame 41.
  • the injection motor 45 rotates the injection ball screw shaft 48a, moves the injection ball screw nut 48b in the shaft direction, and causes the pressure plate 46 to advance and retreat. In accordance with the advancing and retreating of the pressure plate 46, the driving shaft 47 and the screw 43 are caused to advance and retreat.
  • the injection motor 45 causes the screw 43 to advance at a set speed, and supplies the molding material that has accumulated at the front of the screw 43 in the plasticizing process, to fill the injection mold unit 30 from the cylinder 42.
  • a hold pressure process is started when the screw 43 advances to a predetermined position (so called V/P switching position). Note that the hold pressure process may be started when the elapsed time reaches a predetermined time from when the filling process has started.
  • the set speed of the screw 43 may be fixed, or may vary according to the screw position.
  • the injection motor 45 pushes forward the screw 43 at a set pressure, and replenishes the cylinder 42 with the molding material by an amount corresponding to the volume contracted due to the cooling of the molding material in the cavity space.
  • the cooling process is started.
  • a plasticizing process of plasticizing the molding material for the next molding product may be performed.
  • the set pressure of the screw 43 may be fixed, or may vary according to the elapsed time.
  • the lubricant supplying unit 60 supplies lubricant, which is to be supplied to shaft bearings 51 through 53, to the injection ball screw mechanism 48 before supplying the lubricant to the shaft bearings 51 through 53.
  • the shaft bearings 51 through 53 to which the lubricant is to be supplied, are coaxially provided with the injection ball screw shaft 48a.
  • the shaft bearings 51 through 53 may have a receiving inlet for receiving the lubricant from the injection ball screw shaft 48a.
  • the receiving inlet is constituted by, for example, a gap between the inner ring and the outer ring.
  • the type of lubricant may be either lubricating oil or grease.
  • the lubricant supplying unit 60 is provided at the injection ball screw nut 48b, and is constituted by a joint for connecting a pipe extending from a tank acting as a supply source for supplying the lubricant, and the injection ball screw nut 48b.
  • the tank may be fixed to the injection frame 41.
  • the injection ball screw nut 48b does not rotate, and therefore the pipe does not become twisted.
  • the lubricant passes through a flow path formed in the injection ball screw nut 48b, and is supplied between the injection ball screw nut 48b and the injection ball screw shaft 48a.
  • the lubricant supplying unit 60 supplies the lubricant to the injection ball screw mechanism 48, and the supplied lubricant lubricates a part between the injection ball screw shaft 48a and the injection ball screw nut 48b.
  • the injection motor (rotation driving unit) 45 rotates the injection ball screw shaft 48a, the lubricant moves along the injection ball screw shaft 48a, and is carried outside the injection ball screw nut 48b (in both the left and right directions as viewed in FIG. 2 ).
  • the lubricant which has been carried outside the injection ball screw nut 48b, is separated from the injection ball screw shaft 48a by a centrifugal force, and the lubricant can be supplied to each of the shaft bearings 51 through 53 coaxially provided with the injection ball screw shaft 48a.
  • the lubricant which lubricates the injection ball screw mechanism 48, also lubricates the respective shaft bearings 51 through 53, and therefore the total usage amount of lubricant used for the injection ball screw mechanism 48 and the shaft bearings 51 through 53 can be reduced.
  • an exclusively-used lubricant may be supplied to each of the shaft bearings 51 through 53, in addition to the lubricant for lubricating the injection ball screw mechanism 48. In this case also, the total usage amount of lubricant can be reduced.
  • Each of the respective shaft bearings 51 through 53 may be, for example, a rolling bearing, constituted by an outer ring, an inner ring, and a rolling body such as balls that are disposed between the outer ring and the inner ring.
  • the external diameter of each inner ring may be larger than the external diameter of the injection ball screw shaft 48a.
  • the lubricant that has separated from the injection ball screw shaft 48a by the centrifugal force can be easily supplied to the rolling bodies of the shaft bearings 51 through 53.
  • the rolling body of the rolling bearing may be rollers instead of balls.
  • the shaft bearings 51 through 53 may be sliding bearings.
  • the shaft bearings 51, 52 may have a shaft bearing hole through which the driving shaft 47 is inserted, and the driving shaft 47 may have an insertion hole 47a through which the injection ball screw shaft 48a can be inserted. According to the advancing and retreating of the driving shaft 47, the injection ball screw shaft 48a is inserted to and removed from the insertion hole 47a of the driving shaft 47. The injection ball screw shaft 48a is inserted to the shaft bearing hole of the shaft bearings 51, 52, and the lubricant that has separated from the injection ball screw shaft 48a by a centrifugal force can be easily supplied to the shaft bearings 51, 52.
  • a through hole 46a for inserting the injection ball screw shaft 48a is formed, and the shaft bearings 51, 52 of the driving shaft 47 are disposed inside the through hole 46a.
  • the lubricant can easily accumulate inside the through hole 46a, and the lubricant can be easily supplied to the shaft bearings 51, 52.
  • the injection ball screw nut 48b is attached to the pressure plate 46. Another member may be disposed between the pressure plate 46 and the injection ball screw nut 48b, and a member surrounding the outer periphery of the injection ball screw shaft 48a is to be provided at the front of the injection ball screw nut 48b.
  • the lubricant which moves to the front of the injection ball screw nut 48b and separates from the injection ball screw shaft 48a by a centrifugal force, can be prevented from scattering to the surroundings.
  • a through hole 41d may be formed, into which a shaft part extending in the backward direction from the injection ball screw shaft 48a is inserted.
  • the shaft bearing 53 of the shaft part may be disposed inside the through hole 41d.
  • the lubricant can easily accumulate inside the through hole 41d, and the lubricant can be easily supplied to the shaft bearing 53.
  • the injection motor according to the first embodiment rotates the ball screw shaft, and moves the ball screw nut in the shaft direction. Meanwhile, the injection motor according to the present embodiment is different from that of the first embodiment in that the ball screw shaft is rotated, and the ball screw shaft is moved in the shaft direction. In the following, the different points are mainly described.
  • FIG. 3 is a partial cross-sectional view of an injection unit of an injection molding machine according to a second embodiment of the present invention.
  • An injection unit 140 illustrated in FIG. 3 is constituted by an injection frame 41, a cylinder 42, a screw 43, a plasticizing motor 144, an injection motor 145, and a lubricant supplying unit 160.
  • the plasticizing motor 144 rotates the screw 43 in the cylinder 42.
  • the rotation of the plasticizing motor 144 is transmitted to a driving shaft 147 via a belt and a pulley, and the screw 43 is rotated together with the driving shaft 147.
  • Shaft bearings 151, 152 that rotatably support the driving shaft 147 are held by a pressure plate 146. Note that the belt and the pulley may not be provided, and the output shaft of the plasticizing motor 144 may be coaxially joined to the driving shaft 147.
  • the injection motor 145 moves the screw 43 in the cylinder 42.
  • the injection motor 145 is fixed to the back support 41c.
  • the rotation of the injection motor 145 is transmitted to an injection ball screw mechanism 148.
  • the injection ball screw mechanism 148 converts the rotational motion of the injection motor 145 into a linear motion, and transmits the linear motion to the pressure plate 146.
  • the injection ball screw mechanism 148 is constituted by an injection ball screw shaft 148a and an injection ball screw nut 148b.
  • the shaft part that extends in the backward direction from the injection ball screw shaft 148a is splined to the output shaft of the injection motor 145.
  • the injection ball screw shaft 148a can advance and retreat in the shaft direction.
  • the injection ball screw nut 148b is fixed to the back support 41c, and cannot advance and retreat in the shaft direction.
  • the injection motor 145 rotates the injection ball screw shaft 148a and also moves the injection ball screw shaft 148a in the shaft direction, and causes the pressure plate 146 to advance and retreat.
  • the pressure plate 146 holds a shaft bearing 153 that rotatably supports the shaft part that extends in the forward direction from the injection ball screw shaft 148a. In accordance with the advancing and retreating of the pressure plate 146, the driving shaft 147 and the screw 43 are caused to advance and retreat.
  • the lubricant supplying unit 160 supplies the lubricant, which is to be supplied to the shaft bearing 153, to the injection ball screw mechanism 148 before supplying the lubricant to the shaft bearing 153.
  • the shaft bearing 153 for supplying the lubricant is coaxially provided with the injection ball screw shaft 148a.
  • the shaft bearing 153 may have a receiving inlet for receiving the lubricant from the injection ball screw shaft 148a.
  • the receiving inlet is constituted by, for example, a gap between the inner ring and the outer ring.
  • the type of lubricant may be either lubricating oil or grease.
  • the lubricant supplying unit 160 is provided at the injection ball screw nut 148b, and is constituted by a joint for connecting a pipe extending from a tank acting as a supply source for supplying the lubricant, and the injection ball screw nut 148b.
  • the tank may be fixed to the injection frame 41.
  • the injection ball screw nut 148b does not rotate, and therefore the pipe does not become twisted.
  • the injection ball screw nut 148b does not advance or retreat with respect to the injection frame 41, and therefore the pipe does not bend, and a pipe made of metal may be used.
  • the lubricant passes through a flow path formed in the injection ball screw nut 148b, and is supplied between the injection ball screw nut 148b and the injection ball screw shaft 148a.
  • the lubricant supplying unit 160 supplies the lubricant to the injection ball screw mechanism 148, and the supplied lubricant lubricates a part between the injection ball screw shaft 148a and the injection ball screw nut 148b.
  • the injection motor (rotation driving unit) 145 rotates the injection ball screw shaft 148a, the lubricant moves along the injection ball screw shaft 148a, and is carried outside the injection ball screw nut 148b (in both the left and right directions as viewed in FIG. 3 ).
  • the lubricant which has been carried outside the injection ball screw nut 148b, separates from the injection ball screw shaft 148a by a centrifugal force, and the lubricant can be supplied to the shaft bearing 153 coaxially provided with the injection ball screw shaft 148a.
  • the lubricant which lubricates the injection ball screw mechanism 148, also lubricates the shaft bearing 153, and therefore the total usage amount of lubricant used for the injection ball screw mechanism 148 and the shaft bearing 153 can be reduced.
  • an exclusively-used lubricant may be supplied to the shaft bearing 153, in addition to the lubricant for lubricating the injection ball screw mechanism 148. In this case also, the total usage amount of lubricant can be reduced.
  • the shaft bearing 153 may be, for example, a rolling bearing, constituted by an outer ring, an inner ring, a rolling body such as balls that are disposed between the outer ring and the inner ring.
  • the external diameter of the inner ring may be larger than the external diameter of the injection ball screw shaft 148a.
  • the lubricant that has separated from the injection ball screw shaft 148a by the centrifugal force can be easily supplied to the rolling body of the shaft bearing 153.
  • the rolling body of the rolling bearing may be rollers instead of balls.
  • the shaft bearing 153 may be a sliding bearing.
  • a through hole 146a for inserting the injection ball screw shaft 148a is formed, and the shaft bearing 153 is disposed inside the through hole 146a.
  • the lubricant can easily accumulate inside the through hole 146a, and the lubricant can be easily supplied to the shaft bearing 153.
  • the lubricant supplying units 60, 160 are for supplying lubricant to the injection ball screw mechanism 148; however, the lubricant supplying unit 60, 160 may be for supplying lubricant to the mold clamping ball screw mechanism 18 or the ejector ball screw mechanism 22.
  • the shaft bearing to which lubricant is supplied from the lubricant supplying units 60, 160 according to the above embodiments via the injection ball screw mechanisms 48, 148, is coaxially provided with the injection ball screw shafts 48a, 148a; however, the shaft bearing may be provided around the injection ball screw shafts 48a, 148a.
  • injection units 40, 140 are screw in-line type injection units; however, the injection units 40, 140 may be preplasticizing type injection units.
  • the number of shaft bearings to which lubricant is supplied from a single ball screw mechanism is not particularly limited.
  • injection molding machine which is capable of reducing the total amount of lubricant used for a ball screw mechanism and a shaft bearing.

Claims (7)

  1. Machine de moulage par injection comprenant :
    un arbre de vis à billes (48a) et un écrou de vis à billes (48b) constituant un mécanisme de vis à billes (48) pour convertir un mouvement de rotation en un mouvement linéaire ;
    une unité d'entraînement en rotation (45) configurée pour faire tourner l'arbre de vis à billes (48a) ;
    un palier d'arbre (51, 52) ; et
    une unité de fourniture de lubrifiant (60) configurée pour fournir du lubrifiant, qui doit être fourni au palier d'arbre (51, 52), au mécanisme de vis à billes (48) avant de fournir le lubrifiant au palier d'arbre (51, 52),
    dans laquelle la machine de moulage par injection comprend en outre :
    un arbre d'entraînement (47) et un moteur (44) dont la rotation est transmise à l'arbre d'entraînement (47),
    la machine de moulage par injection comprenant en outre un élément mobile (46),
    dans laquelle un trou traversant (46a) pour insérer l'arbre de vis à billes d'injection (48a) est formé dans l'élément mobile (46), et le palier d'arbre (51, 52) est disposé à l'intérieur du trou traversant (46a).
  2. Machine de moulage par injection selon la revendication 1, dans laquelle l'unité de fourniture de lubrifiant (60) est prévue sur l'écrou de vis à billes (48b).
  3. Machine de moulage par injection selon la revendication 1 ou 2, dans laquelle
    l'unité d'entraînement en rotation (45) fait tourner l'arbre de vis à bille (48a) et déplace l'écrou de vis à bille (48b, 148b) dans une direction axiale.
  4. Machine de moulage par injection selon la revendication 3, dans laquelle :
    l'élément mobile (46) est configuré pour se déplacer conjointement avec l'écrou de vis à billes (48b), et
    l'unité de fourniture de lubrifiant (60) fournit le lubrifiant, qui doit être fourni à un palier d'arbre (51, 52) fixé à l'élément mobile (46), au mécanisme de vis à billes avant de fournir le lubrifiant au palier d'arbre (51, 52) fixé à l'élément mobile (46).
  5. Machine de moulage par injection selon la revendication 3 ou 4, dans laquelle
    l'unité de fourniture de lubrifiant (60) fournit le lubrifiant, qui doit être fourni à un palier d'arbre qui supporte de manière rotative une partie d'arbre qui s'étend à partir de l'arbre de vis à billes, au mécanisme de vis à billes avant de fournir le lubrifiant au palier d'arbre qui supporte de manière rotative la partie d'arbre.
  6. Machine de moulage par injection selon la revendication 1 ou 2, dans laquelle
    l'unité d'entraînement en rotation (45) fait tourner l'arbre de vis à billes (48a), et déplace l'arbre de vis à billes (48a) dans une direction axiale.
  7. Machine de moulage par injection rotative selon la revendication 6, dans laquelle
    l'unité de fourniture de lubrifiant (60) fournit le lubrifiant, qui doit être fourni à un palier d'arbre qui supporte de manière rotative une partie d'arbre qui s'étend à partir de l'arbre de vis à billes, au mécanisme de vis à billes avant de fournir le lubrifiant au palier d'arbre qui supporte de manière rotative la partie d'arbre.
EP14156527.5A 2013-03-07 2014-02-25 Machine de moulage à injection Active EP2774742B1 (fr)

Applications Claiming Priority (1)

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JP6696863B2 (ja) * 2016-08-26 2020-05-20 住友重機械工業株式会社 射出成形機
DE102016119581A1 (de) 2016-10-13 2018-04-19 Arburg Gmbh + Co. Kg Formschließeinheit mit Wärmemanagement
JP7077103B2 (ja) * 2018-03-28 2022-05-30 住友重機械工業株式会社 射出成形機

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DE102008057073A1 (de) * 2007-11-20 2009-05-28 Engel Austria Gmbh Antriebsvorrichtung für eine Spritzgießmaschine mit volumenveränderlichen Schmiermittelbehälter
DE102010051766A1 (de) * 2009-11-23 2011-05-26 Engel Austria Gmbh Spindeltrieb mit Schmierölablauf im Dichtbereich

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JP2002028961A (ja) * 2000-07-14 2002-01-29 Japan Steel Works Ltd:The 電動射出成形機のグリース給脂方法およびその装置
JP2004108523A (ja) * 2002-09-19 2004-04-08 Okuma Corp 潤滑装置
JP2004249637A (ja) 2003-02-21 2004-09-09 Sumitomo Heavy Ind Ltd 成形機用自動型締力調整装置
WO2007036244A1 (fr) * 2005-09-23 2007-04-05 Demag Ergotech Gmbh Unite de fermeture pour machine a mouler par injection
WO2007036243A1 (fr) * 2005-09-23 2007-04-05 Demag Ergotech Gmbh Commande de broches pour machine a mouler par injection comportant un dispositif de lubrification
JP5079429B2 (ja) * 2007-09-04 2012-11-21 東洋機械金属株式会社 成形機
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DE102008057073A1 (de) * 2007-11-20 2009-05-28 Engel Austria Gmbh Antriebsvorrichtung für eine Spritzgießmaschine mit volumenveränderlichen Schmiermittelbehälter
DE102010051766A1 (de) * 2009-11-23 2011-05-26 Engel Austria Gmbh Spindeltrieb mit Schmierölablauf im Dichtbereich

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CN104029358B (zh) 2018-02-02
JP6005556B2 (ja) 2016-10-12
CN104029358A (zh) 2014-09-10
JP2014172251A (ja) 2014-09-22

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